The ohp 8000 plays audio directly from any usb flash drive for continuous playback. To add new audio content just copy any mp3 file from your pc to the usb flash drive. Includes a 128mb usb flash drive that is preloaded with nearly 3 hours of great sounding fully licensed music & messages -- so it's all ready to go right out of the box. High quality audio playback coupled with up to 140 hours of playback time (via any off-the-shelf 2gb usb flash drive) makes the ohp 8000 suitable for background music storecasting and music/message on-hold applications.